Exam 4: Space and Time

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Which of the following moons has an atmosphere?

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The most widely accepted theory for the formation of the Moon is the

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A

If the Earth had a 90 degree tilt rather than a 23.5 degree tilt, how many seasons would there be?

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Icy comets that were originally orbiting in the inner part of the solar system could have met which of several fates?

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The main factors that influenced the evolution of the terrestrial planets shortly after their formation were impact cratering, volcanism, proximity to the Sun, and absence or presence of a biosphere.

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The planets orbit the Sun on or close to

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The __________ provides a "guesstimate" to the number of civilizations in our galaxy.

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What supports and sustains almost all life on Earth?

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Earth's Moon is approximately _________ the size of Earth.

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Which is the smallest planet in the solar system?

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The nebular hypothesis proposes that the solar system formed from a huge, swirling cloud of cosmic gas and dust.

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Numerical age is the actual time when a specific event happened.

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How far away is the Earth from the Sun?

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The atmospheres of the Jovian planets are composed mainly of __________ and helium.

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With only a few exceptions, __________ is the source of energy that sustains life on Earth.

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We experience seasons due to the extreme changes of Earth's orbit around the Sun.

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Our solar system is part of the Milky Way Galaxy. About how many galaxies do astronomers believe exist?

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Radiometric dating is possible if a rock contains a measureable amount of

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The solar system is comprised of eight planets. All of the planets (other than Mercury and Venus) have one or more moons. How many moons have been observed?

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The length of a stars life is primarily determined by its __________ .

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